12643936 has 48 divisors (see below), whose sum is σ = 26142480. Its totient is φ = 6013440.

The previous prime is 12643933. The next prime is 12643999. The reversal of 12643936 is 63934621.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12643933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69766 + ... + 69946.

It is an arithmetic number, because the mean of its divisors is an integer number (544635).

Almost surely, 2^12643936 is an apocalyptic number.

12643936 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12643936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13071240).

12643936 is an abundant number, since it is smaller than the sum of its proper divisors (13498544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12643936 is a wasteful number, since it uses less digits than its factorization.

12643936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287 (or 279 counting only the distinct ones).

The product of its digits is 23328, while the sum is 34.

The square root of 12643936 is about 3555.8312670879. The cubic root of 12643936 is about 232.9668332511.

The spelling of 12643936 in words is "twelve million, six hundred forty-three thousand, nine hundred thirty-six".